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How to Send a Fax from Outlook Email (2026 Step-by-Step)
RonFax Editorial · Online fax guides & destination research ·
Send a fax from Outlook or Outlook.com: RonFax email-to-fax with PDF attachment, or browser upload. No fax modem—works with Microsoft 365 and desktop Outlook.
How to send a fax from Outlook email is a common workplace search—especially when HR, insurance, or legal still list a fax number but your office has no fax machine.
HIPAA / PHI notice: Do not use Outlook email-to-fax for patient records, medical forms, insurance information, or other protected health information. The email provider and inbound forwarding layer handle the message before RonFax receives it. For sensitive documents, use the browser upload flow instead, subject to your organization’s approval and applicable vendor agreements.
Outlook cannot dial fax lines natively. RonFax connects your Outlook attachment to the phone fax network.
Method 1 — Email-to-fax from Outlook
- New message in Outlook or Outlook.com
- To:
fax@ronfax.com - Subject: 10-digit US fax number (example:
8005551234) - Attach your PDF (export Word docs to PDF first)
- Send
- Open RonFax’s auto-reply payment link and complete checkout
- We fax your attachment and email status updates
Same flow as Gmail—see also send fax from Gmail.
Method 2 — Browser upload (large files)
- Save attachment from Outlook to your PC
- Open ronfax.com/#send
- Enter destination fax number
- Upload PDF → pay → track status
Better for multi-megabyte packets or when corporate Outlook blocks external auto-replies.
Outlook at work (IT policies)
Some tenants block auto-replies from unknown domains. If fax@ronfax.com is filtered:
- Use ronfax.com upload on the same machine, or
- Forward the PDF to a personal mailbox allowed to reach RonFax
Outlook fax vs store fax
| Retail fax counter | RonFax + Outlook | |
|---|---|---|
| Leave desk | Yes | No |
| Audit trail | Paper receipt | Email + status URL |
| Pricing | Per page at store | Shown before pay |
Compose in Outlook; RonFax handles the fax dial.
Frequently asked questions
- Can Outlook send a fax by itself?
- Outlook sends email, not faxes. RonFax email-to-fax accepts your Outlook message with a PDF attached and transmits to the fax number you specify in the Subject line.
- Does this work with Outlook.com and desktop Outlook?
- Yes. Compose in Outlook on the web, Windows, or Mac—or use ronfax.com in your browser to upload the same PDF.
- What file types can I fax from Outlook?
- PDF is best. Save Word attachments as PDF before sending. RonFax also accepts JPG/PNG via email-to-fax or browser upload.
- Is Outlook email-to-fax suitable for HIPAA documents?
- No. Do not send PHI or medical records through email-to-fax. Use the browser upload flow only after confirming the required HIPAA agreements and controls for your organization.
Send from anywhere in the US
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